Vibrator



April 7, 1937. H. M. DRESSEL 2,078,316

' VIBRATOR Filed July 25, 1935 INVENTOR Henry M Dress-l ATTORNEY Patented Apr. 27, 1937 VIBRATOR- Henry M. Dressel, Oak Park, Ill., aaaignor to Oak Manufacturing Company, Chicago, 111., a corporation of Illinois Application July 25, 1935, Serial N0. 32,989

4 Claims.

This invention relates to vibrators primarily for use in connection with automobile radios wherein the low voltage storage battery current is rapidly interrupted and thereafter converted to high voltage. An object of this invention is to devise a vibrator which will be simple, cheap and be adapted to operate for long periods of time without attention. A further object is to devise a vibrator which will operate without substantial arcing at the contacts and which will be independent of the transformer with which such vibrator customarily operates. Other and additional objects will be apparent as the description proceeds.

In the drawing, Fig. 1 is a diagrammatic representation of the invention.

This structure is diagrammatically shown and may have as one physical embodiment thereof the structure shown in my application Serial No.

758,924, filed December 24, 1934. In the drawing a reed rigidly mounted at one end 2 carries an armature 3 at the free end thereof. Reed carries a driving contact 5 and an additional circuit contact 6. Disposed on opposite sides of the contact 6. are a pair of fixed contacts 8 and 9 with which contact 6 is adapted to alternately I cooperate during the normal operation of the device. An additional fixed contact I0 is provided to cooperate with driving contact 5.

3o Cooperatively associated with armature 3 is a pole piece I 2 of a suitable magnetic field structure. A pair of windings I4 and I5 are adapted to energize magnetic field structure I2 as hereinafter described. These windings are preferably of equal and opposite magnetizing effects and may otherwise be disposed in any suitable manner.

Winding ll has one terminal connected to fixed driving contact III and the other terminal connected to junction point on the line l8. Winding l5 has one terminal connected by means of a wire I! to reed I while the other terminal is connected by conductor 8 to line 20 leading to one terminal of a battery 2|. The other terminal of battery 2| is connected to reed I. Line 20 is connected to the mid-point 22 of a pair of primary windings 23 and 24 of a transformer 25 having a secondary 26. The outer terminals of primary windings 23 and 24 are connected to fixed contacts 8 and 9 respectively.

In its rest position, reed is symmetrically disposed between fixed contacts 8 and 9 with the driving contacts open. Assuming the battery circuit closed (the control of this circuit may be effected by any suitable switching mechanism not shown) winding [5 will be energized by battery 2|. This will cause armature 3 to be attracted to close driving contacts 5 and I0 and circuit contacts 6 and 8. As soon as contacts 5 and I0 are closed, winding M will be energized 5 and neutralize the magnetizing effect of winding l5. Armature 3 will be released and the reed will swing over to its other extreme position closing contacts 6 and 9 and permit the continuous current through winding 5 to again exert its 10 magnetizing effort. In this way windings 23 and 24 will be alternately energized.

It is clear that any potentials in primary windings 23 and 24 howsoever created will not be able in any way to affect either of the windings 15 M or I5 of the vibrator. Furthermore, when the reed is just opening driving contacts 5 and III, the low resistance of battery 2| in comparison to the resistance of winding l5 will permit winding |5 in effect to function as a short circuited secondary and reduce arcing at contacts 5 and I0.

If windings l4 and I5 are of equal size wire and wound in bifilar relationship substantially the same effect will be obtained as is present in my Patent 2,012,123. This efiect in brief is a high starting torque without excessive amplitude of vibration of the reed occasioned by the running losses during the operation of the vibrator.

Having described my invention what I claim is as follows:

1. A vibrator comprising a. magnetizing member having an active pole face, a reed rigidly supported at one end having an armature at the other end and adapted to vibrate in front of said pole face, a driving contact mounted on said 35 reed, a stationary contact cooperating with said driving contact in the attracted position thereof,

a pair of magnetizing windings for said magnetic structure, a connection from said stationary contact to one terminal of one coil, a connection 40 from one terminal of the other coil to said reed, said reed constituting one terminal of the vibrator, and a connection between the other ends of said two coils, said connection constituting the other terminal of said vibrator, said coils being 45 so wound as to have equal and opposite magnetizing effects.

2. The structure of claim 1 wherein said two magnetizing coils are wound in bifilar relationship. 50

3. A vibrator comprising a magnetizing structure having an active pole face, a reed rigidly supported at one end having an armature at the other end and adapted to vibrate in front of said pole face, a pair of magnetizing windings,

10 comprising one of the a driving contact on said reed, an additional contact carried by said reed. a stationary contact cooperating with said driving contact in the attracted position of the reed. stationary contacts cooperating with said additional reed contact in each of the two extreme reed positions. a connection from said stationary driving contact to one terminal or one coil, a connection from a terminal oi the other coil to said reed, said reed energizing terminals for said vibrator, a connection between each remain- HENRY M. DRESSHI. 

